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Decoy receptor 3 (DcR3) induces osteoclast formation from monocyte/macrophage lineage precursor cells

C R Yang1, J H Wang, S L Hsieh

  • 1Department of Pharmacology, College of Medicine, National Taiwan University, Taipei, Taiwan.

Cell Death and Differentiation
|March 6, 2004
PubMed

Insights

Decoy receptor 3 (DcR3) promotes osteoclast formation in monocytes and macrophages. This process involves reverse signaling, activating TNF-alpha release and MAPK pathways, potentially impacting bone metastases.

Area of Science:

  • Immunology
  • Cell Biology
  • Bone Biology

Background:

  • Decoy receptor 3 (DcR3), a TNF receptor superfamily member, was initially understood to neutralize cytokines like FasL, LIGHT, and TL1A.
  • Emerging evidence suggests DcR3 engages in reverse signaling, influencing cellular functions beyond simple ligand neutralization.

Purpose of the Study:

  • To investigate the role of DcR3 in osteoclastogenesis.
  • To elucidate the signaling pathways and molecular mechanisms underlying DcR3-mediated osteoclast formation.

Main Methods:

  • Osteoclast differentiation assays using human monocytes, murine RAW264.7 macrophages, and bone marrow cells.
  • Analysis of osteoclast-specific markers (TRAP, CD51/61, MMP-9) and bone resorption activity.
  • Western blot analysis to assess MAPK pathway activation (ERK, p38) and TNF-alpha production.

Main Results:

  • DcR3 successfully induced osteoclast formation from various cell types, characterized by polynuclear giant morphology and bone resorption.
  • DcR3-induced cells expressed key osteoclast markers: TRAP, CD51/61, and MMP-9.
  • DcR3 treatment stimulated TNF-alpha release and activated ERK and p38 MAPK signaling pathways, an effect abrogated by TNFR-Fc.

Conclusions:

  • DcR3 acts as a critical regulator of osteoclast formation through reverse signaling.
  • The mechanism involves activation of ERK and p38 MAPK pathways, leading to TNF-alpha synthesis.
  • DcR3's role in osteoclastogenesis may contribute to osteolytic activity in bone metastases.

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